Originally Posted by
SJPaul
Any idea if they'll tell you if call reservations?
Never tried.
Some UA agents will tell you if there is "I" or "O" inventory, but they will tell you that there is no gaurantee that LH will honor an upgrade request just because the inventory is available.
I personally have had a 100% success rate with confirmed upgrades on LH if there was I or O inventory available when I requested the upgrade.